Share-based Payments (Compensation Costs) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total compensation costs related to share based payments	$ 10.1	$ 14.9	$ 45.2	$ 41.8
Selling, general and administrative:
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock option compensation expense	0.7	1.1	3.0	5.4
Equity-classified share units	7.3	10.9	32.9	23.8
Liability-classified share units	0.6	0.1	2.1	0.6
Employee share purchase plan	1.2	1.3	5.8	2.6
Total compensation costs related to share based payments	9.8	13.4	43.8	32.4
Acquisition-related and integration costs:
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Acceleration of share-based payments expense	0.1	0.6	1.0	6.5
Share-based continuing employment costs	0.2	0.9	0.4	2.9
Total compensation costs related to share based payments	$ 0.3	$ 1.5	$ 1.4	$ 9.4